int
osiop_mvme68k_intr(void *arg)
{
struct osiop_softc *sc = arg;
u_int8_t istat;
if (sc->sc_flags & OSIOP_INTSOFF)
return 0;
istat = osiop_read_1(sc, OSIOP_ISTAT);
if ((istat & (OSIOP_ISTAT_SIP | OSIOP_ISTAT_DIP)) == 0)
return 0;
/*
* 53c710 manual recommends reading dstat and sstat0 at least
* 12 clk cycles apart if reading as bytes (which is what
* pcc2 permits). Stick in a 1us delay between accessing dstat and
* sstat0 below.
*
* save interrupt status, DMA status, and SCSI status 0
* (may need to deal with stacked interrupts?)
*/
sc->sc_istat = istat;
sc->sc_sstat0 = osiop_read_1(sc, OSIOP_SSTAT0);
DELAY(25);
sc->sc_dstat = osiop_read_1(sc, OSIOP_DSTAT);
osiop_intr(sc);
return 1;
}
static int
osiop_pcctwo_intr(void *arg)
{
struct osiop_pcctwo_softc *sc = arg;
u_char istat;
/*
* Catch any errors which can happen when the SIOP is
* local bus master...
*/
istat = pcc2_reg_read(sys_pcctwo, PCC2REG_SCSI_ERR_STATUS);
if ((istat & PCCTWO_ERR_SR_MASK) != 0) {
printf("%s: Local bus error: 0x%02x\n",
device_xname(sc->sc_osiop.sc_dev), istat);
istat |= PCCTWO_ERR_SR_SCLR;
pcc2_reg_write(sys_pcctwo, PCC2REG_SCSI_ERR_STATUS, istat);
}
/* This is potentially nasty, since the IRQ is level triggered... */
if (sc->sc_osiop.sc_flags & OSIOP_INTSOFF)
return (0);
istat = osiop_read_1(&sc->sc_osiop, OSIOP_ISTAT);
if ((istat & (OSIOP_ISTAT_SIP | OSIOP_ISTAT_DIP)) == 0)
return (0);
/* Save interrupt details for the back-end interrupt handler */
sc->sc_osiop.sc_sstat0 = osiop_read_1(&sc->sc_osiop, OSIOP_SSTAT0);
sc->sc_osiop.sc_istat = istat;
sc->sc_osiop.sc_dstat = osiop_read_1(&sc->sc_osiop, OSIOP_DSTAT);
/* Deal with the interrupt */
osiop_intr(&sc->sc_osiop);
return (1);
}